diff --git a/pom.xml b/pom.xml
index 1fa33e9..7371465 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,7 +4,7 @@
 
     <groupId>com.gerritforge</groupId>
     <artifactId>global-refdb</artifactId>
-    <version>3.5.4.1</version>
+    <version>3.6.3.1</version>
     <packaging>jar</packaging>
 
     <name>global-refdb</name>
@@ -38,7 +38,7 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <gerrit.version>3.5.4</gerrit.version>
+        <gerrit.version>3.6.3</gerrit.version>
     </properties>
 
     <dependencies>
@@ -81,7 +81,7 @@
                 <artifactId>maven-compiler-plugin</artifactId>
                 <version>3.6.1</version>
                 <configuration>
-                    <source>1.8</source>
+                    <source>11</source>
                     <target>11</target>
                 </configuration>
             </plugin>
diff --git a/src/main/java/com/gerritforge/gerrit/globalrefdb/validation/RefUpdateValidator.java b/src/main/java/com/gerritforge/gerrit/globalrefdb/validation/RefUpdateValidator.java
index 7fa5645..e2a0bd3 100644
--- a/src/main/java/com/gerritforge/gerrit/globalrefdb/validation/RefUpdateValidator.java
+++ b/src/main/java/com/gerritforge/gerrit/globalrefdb/validation/RefUpdateValidator.java
@@ -231,10 +231,8 @@
               Project.nameKey(projectName), refPair.compareRef, refPair.putValue);
     } catch (GlobalRefDbSystemError e) {
       logger.atWarning().withCause(e).log(
-          "Not able to persist the data in Zookeeper for project '{}' and ref '{}', message: {}",
-          projectName,
-          refPair.getName(),
-          e.getMessage());
+          "Not able to persist the data in Zookeeper for project '%s' and ref '%s', message: %s",
+          projectName, refPair.getName(), e.getMessage());
       throw e;
     }
 
diff --git a/src/main/java/com/gerritforge/gerrit/globalrefdb/validation/SharedRefDbGitRepositoryManager.java b/src/main/java/com/gerritforge/gerrit/globalrefdb/validation/SharedRefDbGitRepositoryManager.java
index 763aeb4..24bed90 100644
--- a/src/main/java/com/gerritforge/gerrit/globalrefdb/validation/SharedRefDbGitRepositoryManager.java
+++ b/src/main/java/com/gerritforge/gerrit/globalrefdb/validation/SharedRefDbGitRepositoryManager.java
@@ -25,7 +25,7 @@
 import com.google.inject.Singleton;
 import com.google.inject.name.Named;
 import java.io.IOException;
-import java.util.SortedSet;
+import java.util.NavigableSet;
 import org.eclipse.jgit.errors.RepositoryNotFoundException;
 import org.eclipse.jgit.lib.Repository;
 
@@ -110,7 +110,7 @@
   }
 
   @Override
-  public SortedSet<Project.NameKey> list() {
+  public NavigableSet<Project.NameKey> list() {
     return repositoryManager().list();
   }
 
diff --git a/src/test/java/com/gerritforge/gerrit/globalrefdb/validation/dfsrefdb/RefUpdateStub.java b/src/test/java/com/gerritforge/gerrit/globalrefdb/validation/dfsrefdb/RefUpdateStub.java
index e78ba6d..2da186b 100644
--- a/src/test/java/com/gerritforge/gerrit/globalrefdb/validation/dfsrefdb/RefUpdateStub.java
+++ b/src/test/java/com/gerritforge/gerrit/globalrefdb/validation/dfsrefdb/RefUpdateStub.java
@@ -15,7 +15,7 @@
 package com.gerritforge.gerrit.globalrefdb.validation.dfsrefdb;
 
 import java.io.IOException;
-import org.apache.commons.lang.NotImplementedException;
+import org.apache.commons.lang3.NotImplementedException;
 import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.lib.Ref;
 import org.eclipse.jgit.lib.RefDatabase;